Liner-propellant bond tests

Details Liner-propellant bond tests Liner-propellant bond tests

1983-10-05

1985-11-12

Lechert, Jr., Stephen J.

Plastic and nonmetallic article shaping or treating: processes

Explosive or propellant article shaping or treating

Rolling to form sheet or rod

73788, 102290, 102291, 149 199, C06B 2100, C06B 4510

Patent

active

045527067

ABSTRACT:
A method of determining tensile bond strength and lap shear strength betw a liner/insulation material and a propellant composition which is cured to portions of the liner/insulation material.
The liner/insulation material is bonded to a propellant composition in a dogbone configuration by positioning a predetermined size of the liner/insulation material in a groove that is constructed in a mold in a transverse direction for a tensile bond strength specimen whereby the propellant is bonded to each side of the exposed liner/insulation material. The lap shear specimen is formed in a mold wherein a predetermined size of the liner/insulation material is longitudinally positioned in a groove that is constructed in a mold. The liner/insulation material is centered with a pair of spacers having about one-half of the length of the liner/insulation material to prevent a cast propellant composition from binding to the portion covered by the spacers but to permit the remaining portion of the liner/insulation material to be embedded and cured in the propellant composition that is cast and cured in the mold. After curing the tensile strength specimen and the lap shear specimen having the liner/material bonded to the cured propellant, each specimen is tested in an Instron testing machine to determine bond strength and bond characteristics of the test specimens by evaluating the strain at maximum stress, maximum strain, type of break and total area under the stress strain curve.

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